BM-8-24 Self-Propelled Rocket Launcher Interior Kit

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The Katyusha (Russian: Катю́ша, IPA:[kɐˈtʲuʂə]^ⓘ) is a type of rocket artillery first built and fielded by the Soviet Union in World War II. Multiple rocket launchers
such as these deliver explosives to a target area more intensively than
conventional artillery, but with lower accuracy and requiring a longer
time to reload. They are fragile compared to artillery guns, but are
cheap, easy to produce, and usable on almost any chassis. The Katyushas
of World War II, the first self-propelled artillery mass-produced by the Soviet Union, were usually mounted on ordinary trucks.
This mobility gave the Katyusha, and other self-propelled artillery,
another advantage: being able to deliver a large blow all at once, and
then move before being located and attacked with counter-battery fire.

Katyusha weapons of World War II included the BM-13 launcher, light BM-8, and heavy BM-31. Today, the nickname Katyusha is also applied to newer truck-mounted post-Soviet – in addition to non-Soviet – multiple-rocket launchers, notably the common BM-21 Grad and its derivatives.